CN110138456B

CN110138456B - Optical device and optical signal processing method

Info

Publication number: CN110138456B
Application number: CN201810126437.8A
Authority: CN
Inventors: 卢彦兆; 王勰; 李良川; 邓舒鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-02-08
Filing date: 2018-02-08
Publication date: 2021-07-09
Anticipated expiration: 2038-02-08
Also published as: US10993004B2; WO2019153709A1; US20200366977A1; CN110138456A

Abstract

The application provides an optical device and an optical signal processing method.A first light splitting part splits light of a light source to obtain a first optical signal, a second optical signal and a third optical signal; the first MZ modulator drives the first optical signal according to the first clock signal to modulate the first optical signal and output a fourth optical signal; the second MZ modulator drives a second optical signal according to a second clock signal to modulate the second optical signal and output a fifth optical signal; the first optical coupler couples the fourth optical signal and the fifth optical signal and outputs a sixth optical signal and a seventh optical signal; the power regulator and the phase shifter carry out power regulation and phase shifting on the third optical signal and output an eighth optical signal; the second optical splitting section splits the eighth optical signal into a ninth optical signal and a tenth optical signal; the second optical coupler combines the sixth optical signal and the ninth optical signal to offset a residual signal of the sixth optical signal; the third optical coupler combines the seventh optical signal and the tenth optical signal to cancel a residual signal of the seventh optical signal. To improve the quality of the output signal.

Description

Optical device and optical signal processing method

Technical Field

The present invention relates to communications technologies, and in particular, to an optical device and an optical signal processing method.

Background

With the continuous development of communication technology, the requirements of communication systems on transmission bandwidth and capacity in optical fiber transmission technology are higher and higher. To meet bandwidth and capacity requirements, multi-channel transmission techniques have emerged.

For example: the prior art provides an optical frequency shifter, comprising: an input port; an input-to-output optical coupler connected to the one input port; two Mach Zehnder (MZ) modulators optically connected to two outputs of the one-input-two-output optical coupler, two-input-two-output optical couplers optically connected to respective outputs of the two MZ modulators, and two output optical ports connected to two outputs of the two-input-two-output optical couplers.

The optical frequency shifter adopts a two-channel output technology, and because of the problems of extinction ratio, bias point control and the like of the MZ modulator, carrier leakage may exist in the two channels, so that the quality of output signals is not high.

Disclosure of Invention

The application provides an optical device and an optical signal processing method, thereby improving the quality of an output signal.

In a first aspect, the present application provides a light device comprising:

the first light splitting part is used for splitting a light source with the frequency f0 to form at least three optical signals, and the at least three optical signals comprise: a first optical signal, a second optical signal, and a third optical signal;

a first MZ modulator for driving the first optical signal according to a first clock signal cos (2 π ft) to modulate the first optical signal and output a fourth optical signal, wherein f is the frequency of the first clock signal;

a second MZ modulator for driving the second optical signal according to the second clock signal sin (2 π ft) to modulate the second optical signal and output a fifth optical signal;

the first optical coupler is used for coupling the fourth optical signal and the fifth optical signal and outputting a sixth optical signal and a seventh optical signal;

the power regulator and the phase shifter are respectively used for carrying out power regulation and phase shifting on the third optical signal and outputting an eighth optical signal;

a second light splitting part for splitting the eighth optical signal into a ninth optical signal and a tenth optical signal;

the second optical coupler is used for multiplexing the sixth optical signal and the ninth optical signal, outputting an eleventh optical signal with the frequency of f0+ f, and canceling a residual signal of the sixth optical signal at f 0;

and the third optical coupler is used for multiplexing the seventh optical signal and the tenth optical signal, outputting a twelfth optical signal with the frequency of f0-f, and canceling a residual signal of the seventh optical signal at f 0.

The beneficial effect of this application includes: since the ninth optical signal and the tenth optical signal cancel the residual signal at f0 of the sixth optical signal and the seventh optical signal, respectively, the quality of the output signal can be improved.

Alternatively, the first clock signal and the second clock signal are generated by the same clock source, or the first clock signal and the second clock signal are generated by two clock sources that are phase-synchronized.

Optionally, the optical device further comprises:

a first modulator for modulating the eleventh optical signal;

a second modulator for modulating the twelfth optical signal;

and the fourth optical coupler is used for coupling the modulated eleventh optical signal and the modulated twelfth optical signal into a thirteenth optical signal and outputting the thirteenth optical signal.

The optical device can multiplex the sixth optical signal and the ninth optical signal, output an eleventh optical signal with the frequency of f0+ f, and cancel a residual signal of the sixth optical signal at the f 0; and multiplexing the seventh optical signal and the tenth optical signal, outputting a twelfth optical signal with the frequency f0-f, and canceling a residual signal of the seventh optical signal at the f 0. And the modulated eleventh optical signal and the modulated twelfth optical signal are coupled into a thirteenth optical signal, so that the quality of an output signal is improved.

Optionally, the at least three optical signals further comprise: fourteenth optical signal, the optical device further comprising:

a third modulator for modulating the eleventh optical signal;

a fourth modulator for modulating the twelfth optical signal;

a fifth modulator for modulating the fourteenth optical signal;

and the fifth optical coupler is used for coupling the modulated eleventh optical signal, the modulated twelfth optical signal and the modulated fourteenth optical signal into a fifteenth optical signal and outputting the fifteenth optical signal.

The beneficial effect of this application includes: the fifteenth optical signal resulting from the final coupling may be divided into three subcarriers. Since the three subcarriers are formed by independently modulating the third modulator, the fourth modulator and the fifth modulator, any mode of multicarrier modulation can be realized, and Flexible and arbitrary flexile modulation can be realized.

Optionally, the optical device further comprises:

the first ICR is used for receiving the first optical carrier and carrying out coherent detection on the eleventh optical signal and the first optical carrier to obtain a first coherent detection signal;

the first analog-to-digital converter ADC is used for performing analog-to-digital conversion on the first coherent detection signal to obtain a first digital signal;

the second ICR is used for receiving a second optical carrier and carrying out coherent detection on the twelfth optical signal and the second optical carrier to obtain a second coherent detection signal;

the second ADC is used for carrying out analog-to-digital conversion on the second coherent detection signal to obtain a second digital signal;

and the processor is used for processing the first digital signal and the second digital signal.

The beneficial effect of this application includes: the output eleventh optical signal and the output twelfth optical signal can be used as local oscillation light sources of the first ICR and the second ICR respectively, the first ICR and the second ICR respectively and independently receive two carriers, coherent detection is carried out on the corresponding carriers and the local oscillation light sources, coherent detection signals are respectively output to the first ADC and the second ADC, the first ADC and the second ADC respectively carry out analog-to-digital conversion on the corresponding coherent detection signals to obtain a first digital signal and a second digital signal, the processor can independently process the first digital signal and the second digital signal, and can also process the first digital signal and the second digital signal jointly to obtain the beneficial effect of eliminating mutual crosstalk between the two carriers with frequencies of f0-f and f0+ f.

Optionally, the at least three optical signals further comprise: sixteenth optical signal, the optical device further comprising:

the third ICR is used for receiving a third optical carrier and carrying out coherent detection on the sixteenth optical signal and the third optical carrier to obtain a third coherent detection signal;

the third ADC is used for carrying out analog-to-digital conversion on the third phase interference detection signal to obtain a third digital signal;

and a processor for processing the third digital signal.

The beneficial effect of this application includes: the processor can independently process the first digital signal, the second digital signal and the third digital signal, and can also process the first digital signal, the second digital signal and the third digital signal jointly, so as to obtain the beneficial effect of eliminating the mutual crosstalk among certain carriers.

In a second aspect, the present application provides a light device comprising:

a second light splitting section for splitting the third optical signal into an eighth optical signal and a ninth optical signal;

the first power regulator and the first phase shifter are used for carrying out power regulation and phase shifting on the eighth optical signal and outputting a tenth optical signal;

the second power regulator and the second phase shifter are used for carrying out power regulation and phase shifting on the ninth optical signal and outputting an eleventh optical signal;

the second optical coupler is used for multiplexing the sixth optical signal and the tenth optical signal, outputting a twelfth optical signal with the frequency of f0+ f, and canceling a residual signal of the sixth optical signal at f 0;

and the third optical coupler is used for multiplexing the seventh optical signal and the eleventh optical signal, outputting a thirteenth optical signal with the frequency of f0-f, and canceling a residual signal of the seventh optical signal at f 0.

The beneficial effect of this application includes: since the tenth optical signal and the eleventh optical signal cancel the residual signal at f0 of the sixth optical signal and the seventh optical signal, respectively, the quality of the output signal can be improved.

Optionally, the optical device further comprises:

a first modulator for modulating the twelfth optical signal;

a second modulator for modulating the thirteenth optical signal;

and the fourth optical coupler is used for coupling the modulated twelfth optical signal and the modulated thirteenth optical signal into a fourteenth optical signal and outputting the fourteenth optical signal.

The beneficial effect of this application includes: the optical device may multiplex the sixth optical signal and the tenth optical signal, output a twelfth optical signal with a frequency of f0+ f, and cancel a residual signal of the sixth optical signal at the f 0; and multiplexing the seventh optical signal and the eleventh optical signal, outputting a thirteenth optical signal with the frequency of f0-f, and canceling a residual signal of the seventh optical signal at the f 0. And the twelfth optical signal and the thirteenth optical signal after modulation are coupled into a fourteenth optical signal, so that the quality of an output signal is improved.

Optionally, the at least three optical signals further comprise: a fifteenth optical signal, the optical device further comprising:

a third modulator for modulating the twelfth optical signal;

a fourth modulator for modulating the thirteenth optical signal;

a fifth modulator for modulating a fifteenth optical signal;

and the fifth optical coupler is used for coupling the modulated twelfth optical signal, the modulated thirteenth optical signal and the modulated fifteenth optical signal into a sixteenth optical signal and outputting the sixteenth optical signal.

The beneficial effect of this application includes: the sixteenth optical signal resulting from the final coupling may be divided into three subcarriers. Since the three subcarriers are formed by independently modulating the third modulator, the fourth modulator and the fifth modulator, any mode of multicarrier modulation can be realized, and Flexible and arbitrary flexile modulation can be realized.

Optionally, the optical device further comprises:

the first ICR is used for receiving the first optical carrier and carrying out coherent detection on the twelfth optical signal and the first optical carrier to obtain a first coherent detection signal;

the second ICR is used for receiving a second optical carrier and carrying out coherent detection on the thirteenth optical signal and the second optical carrier to obtain a second coherent detection signal;

The beneficial effect of this application includes: the processor can independently process the first digital signal and the second digital signal, and can also process the first digital signal and the second digital signal jointly, so as to obtain the beneficial effect of eliminating certain mutual crosstalk between carriers.

Optionally, the at least three optical signals further comprise: a seventeenth optical signal, the optical device further comprising:

the third ICR is used for receiving a third optical carrier and carrying out coherent detection on the seventeenth optical signal and the third optical carrier to obtain a third coherent detection signal;

and a processor for processing the third digital signal.

The following provides an optical signal processing method, wherein the method can be performed by the above optical device, and the content and effect thereof will not be described in detail below.

In a third aspect, the present application provides an optical signal processing method, including: splitting a light source with the frequency f0 to form at least three optical signals, wherein the at least three optical signals include: a first optical signal, a second optical signal, and a third optical signal; driving the first optical signal according to a first clock signal cos (2 pi ft) to modulate the first optical signal to obtain a fourth optical signal, wherein f is the frequency of the first clock signal; driving the second optical signal according to the second clock signal sin (2 pi ft) to modulate the second optical signal to obtain a fifth optical signal; coupling the fourth optical signal and the fifth optical signal to obtain a sixth optical signal and a seventh optical signal; carrying out power regulation and phase shifting on the third optical signal to obtain an eighth optical signal; dividing the eighth optical signal into a ninth optical signal and a tenth optical signal; combining the sixth optical signal and the ninth optical signal to obtain an eleventh optical signal with the frequency of f0+ f, and canceling a residual signal of the sixth optical signal at f 0; and combining the seventh optical signal and the tenth optical signal to obtain a twelfth optical signal with the frequency of f0-f, and canceling the residual signal of the seventh optical signal at f 0.

In a fourth aspect, the present application provides an optical signaling method comprising: splitting a light source with the frequency f0 to form at least three optical signals, wherein the at least three optical signals include: a first optical signal, a second optical signal, and a third optical signal; driving the first optical signal according to a first clock signal cos (2 pi ft) to modulate the first optical signal to obtain a fourth optical signal, wherein f is the frequency of the first clock signal; driving the second optical signal according to the second clock signal sin (2 pi ft) to modulate the second optical signal to obtain a fifth optical signal; coupling the fourth optical signal and the fifth optical signal to obtain a sixth optical signal and a seventh optical signal; dividing the third optical signal into an eighth optical signal and a ninth optical signal; carrying out power regulation and phase shifting on the eighth optical signal to obtain a tenth optical signal; performing power adjustment and phase shifting on the ninth optical signal to obtain an eleventh optical signal; combining the sixth optical signal and the tenth optical signal to obtain a twelfth optical signal with the frequency of f0+ f, and canceling a residual signal of the sixth optical signal at f 0; and combining the seventh optical signal and the eleventh optical signal to obtain a thirteenth optical signal with the frequency of f0-f, and canceling the residual signal of the seventh optical signal at f 0.

The application provides an optical device and an optical signal processing method, the optical device includes a first light splitting part, a first MZ modulator, a second MZ modulator, a first optical coupler, a power regulator, a phase shifter, a second light splitting part, a second optical coupler and a third optical coupler, wherein the first light splitting part is used for splitting a light source with frequency f0 to form at least three optical signals, and the at least three optical signals include: a first optical signal, a second optical signal, and a third optical signal; the first MZ modulator is used for driving the first optical signal according to the first clock signal cos (2 pi ft) so as to modulate the first optical signal and output a fourth optical signal; the second MZ modulator is used for driving a second optical signal according to a second clock signal sin (2 pi ft) to modulate the second optical signal and output a fifth optical signal; the first optical coupler is used for coupling the fourth optical signal and the fifth optical signal and outputting a sixth optical signal and a seventh optical signal; the power regulator and the phase shifter are respectively used for carrying out power regulation and phase shifting on the third optical signal and outputting an eighth optical signal; the second light splitting part is used for splitting the eighth optical signal into a ninth optical signal and a tenth optical signal; the second optical coupler is used for multiplexing the sixth optical signal and the ninth optical signal, outputting an eleventh optical signal with the frequency of f0+ f, and canceling a residual signal of the sixth optical signal at f 0; the third optical coupler is used for multiplexing the seventh optical signal and the tenth optical signal, outputting a twelfth optical signal with the frequency f0-f, and canceling a residual signal of the seventh optical signal at f 0. Thereby improving the quality of the output signal.

Drawings

Fig. 1 is a schematic structural diagram of an optical device according to a first embodiment of the present application;

fig. 2 is a schematic structural diagram of an optical device provided in the second embodiment of the present application;

fig. 3 is a schematic structural diagram of an optical device provided in the third embodiment of the present application;

fig. 4 is a schematic structural diagram of an optical device according to a fourth embodiment of the present application;

fig. 5 is a schematic structural diagram of an optical device provided in the fifth embodiment of the present application;

fig. 6 is a schematic structural diagram of an optical device according to a sixth embodiment of the present application;

fig. 7 is a schematic structural diagram of an optical device according to a seventh embodiment of the present application;

fig. 8 is a schematic structural diagram of an optical device according to an eighth embodiment of the present application;

fig. 9 is a schematic structural diagram of an optical device according to ninth embodiment of the present application;

fig. 10 is a schematic structural diagram of an optical device provided in the tenth embodiment of the present application;

fig. 11 is a flowchart of an optical signal processing method according to an embodiment of the present application;

fig. 12 is a flowchart of an optical signal processing method according to another embodiment of the present application;

fig. 13 is a flowchart of an optical signal processing method according to yet another embodiment of the present application;

fig. 14 is a flowchart of an optical signal processing method according to yet another embodiment of the present application;

fig. 15 is a flowchart of an optical signal processing method according to another embodiment of the present application;

fig. 16 is a flowchart of an optical signal processing method according to an embodiment of the present application;

fig. 17 is a flowchart of an optical signal processing method according to another embodiment of the present application;

fig. 18 is a flowchart of an optical signal processing method according to still another embodiment of the present application;

fig. 19 is a flowchart of an optical signal processing method according to another embodiment of the present application;

fig. 20 is a flowchart of an optical signal processing method according to still another embodiment of the present application.

Detailed Description

The prior art provides an optical frequency shifter, comprising: an input port; an input-to-output optical coupler connected to the one input port; two MZ modulators optically connected to two outputs of the one-input two-output optical coupler, two-input two-output optical couplers optically connected to the respective outputs of the two MZ modulators, and two output optical ports connected to two outputs of the two-input two-output optical couplers. The optical frequency shifter adopts a two-channel output technology, and because of the problems of extinction ratio, bias point control and the like of the MZ modulator, carrier leakage and the like may exist in the two channels. Thereby causing a problem of low quality of the output signal.

In order to solve the above technical problem, the present application provides an optical device and an optical signal processing method.

Example one

Fig. 1 is a schematic structural diagram of an optical device according to an embodiment of the present application, where the optical device may be a multi-carrier generator, a modulator, a transmitter, a receiver, or the like, which is not limited in this application. The optical device includes: a first light splitting section 101, a first MZ modulator 102, a second MZ modulator 103, a first optical coupler 104, a power regulator 105, a phase shifter 106, a second light splitting section 107, a second optical coupler 108 and a third optical coupler 109, each having at least one input and at least one output.

The input end of the first light splitting part 101 is used for acquiring a light source generated by a laser. A plurality of output terminals of the first light splitting section 101 are connected to an input terminal of the first MZ modulator 102, an input terminal of the second MZ modulator 103, and an input terminal of the power conditioner 105, respectively. An output of the power regulator 105 is connected to an input of a phase shifter 106. An output terminal of the first MZ modulator 102 and an output terminal of the second MZ modulator 103 are connected to an input terminal of the first optical coupler 104, respectively. Two output terminals of the first optical coupler 104 are connected to an input terminal of the second optical coupler 108 and an input terminal of the third optical coupler 109, respectively. An output end of the phase shifter 106 is connected to an input end of the second dichroic portion 107, and two output ends of the second dichroic portion 107 are connected to an input end of the second optical coupler 108 and an input end of the third optical coupler 109, respectively.

Specifically, the first light splitting part 101 is configured to split a light source with a frequency f0 to form at least three optical signals, where the at least three optical signals include: a first optical signal, a second optical signal, and a third optical signal. The first light splitting part 101 may be an optical coupler, a light splitter, or the like, which is not limited in the present application. The first light splitting part 101 forms at least three optical signals, which are all optical signals with frequency f 0.

The first MZ modulator 102 is configured to drive the first optical signal according to a first clock signal cos (2 π ft) to modulate the first optical signal and output a fourth optical signal, where f is the frequency of the first clock signal. And a second MZ modulator 103 for driving the second optical signal according to a second clock signal sin (2 π ft) to modulate the second optical signal and output a fifth optical signal, wherein the frequencies of the first and second clock signals are both f.

As described above, the first optical signal and the second optical signal enter the first MZ modulator 102 and the second MZ modulator 103, respectively. The first clock signal cos (2 pi ft) is used for driving the first optical signal to modulate the first optical signal and output a fourth optical signal, f represents the frequency of the first clock signal, and t represents time. As shown in fig. 1, the fourth optical signal output from the first MZ modulator 102 includes three spectral structures in which the line spectrum in the middle is the residual signal of the fourth optical signal at f0, the line spectra on both sides represent the effective signal of the fourth optical signal, and the frequencies of the line spectra on both sides are f0-f and f0+ f, respectively. The residual signal of the fourth optical signal at f0 refers to the carrier leaked at f0 in addition to the valid signal in the fourth optical signal. Generalizing this definition, a residual signal of an optical signal refers to a carrier wave that leaks in the optical signal in addition to a valid signal, and is also referred to as an invalid signal. The first optical signal equivalent to one wavelength is modulated by the first MZ modulator to obtain a fourth optical signal, which includes optical signals of two wavelengths and a residual signal at f0, wherein the frequency interval of the optical signals of the two wavelengths is 2 f.

The second clock signal sin (2 π ft) is used to drive the second optical signal to modulate the second optical signal and output a fifth optical signal, f represents the frequency of the second clock signal, and t represents time. The first clock signal and the second clock signal have the same frequency, and are both f. As shown in fig. 1, the fifth optical signal output from the second MZ modulator 103 includes a spectral structure with three line spectrums as main, the middle line spectrum is a residual signal of the fifth optical signal at f0, the line spectrums on both sides represent an effective signal of the fifth optical signal, and the frequencies of the line spectrums on both sides are f0-f and f0+ f, respectively. The second optical signal equivalent to one wavelength is modulated by the second MZ modulator to obtain a fifth optical signal, which includes the optical signals of two wavelengths and the residual signal at f0, wherein the frequency interval of the optical signals of two wavelengths is 2 f.

Optionally, the first clock signal and the second clock signal are generated by two clock sources that are phase synchronized. Alternatively, the first clock signal and the second clock signal are generated by the same clock source, for example: as shown in fig. 1, the first clock signal and the second clock signal are generated by the same clock source, and the second clock signal can be obtained by phase-shifting 1/4 cycles of the first clock signal by the clock source driving the first clock signal.

And a first optical coupler 104 for coupling the fourth optical signal and the fifth optical signal and outputting a sixth optical signal and a seventh optical signal. The first optical coupler 104 may be a two-input two-output optical coupler, i.e., a 2X2 coupler, and the jones matrix of the 2X2 coupler is

The 2X2 coupler couples the fourth optical signal and the fifth optical signal through the jones matrix, and outputs a sixth optical signal and a seventh optical signal. WhereinThe sixth optical signal includes: the effective signal cos (2 π ft) + j · sin (2 π ft) ═ e^j2πftAnd, the residual signal of the sixth optical signal at f0, as shown in fig. 1, the sixth optical signal includes two spectral structures with dominant line spectra, the left line spectrum is the residual signal of the sixth optical signal at f0, and the right line spectrum represents the effective signal cos (2 pi ft) + j · sin (2 pi ft) ═ e) of the sixth optical signal^j2πftThe frequencies are f0+ f, respectively. Accordingly, the seventh optical signal includes: the valid signal cos (2 π ft) -j · sin (2 π ft) ═ j · e^-j2πftAnd, the residual signal of the seventh optical signal at f 0. As shown in fig. 1, the seventh optical signal includes two spectral structures in which the line spectra are dominant, and the line spectrum on the left side represents the effective signal cos (2 pi ft) -j · sin (2 pi ft) -j · e of the seventh optical signal^-j2πftThe frequencies are f0-f, respectively. The line spectrum on the right represents the residual signal of the seventh optical signal at f 0.

As described above, due to the problems of the extinction ratio and the bias point control of the MZ modulator, and the fact that the powers of the branches of the 2 × 2 coupler are not completely consistent, a residual signal exists at f0 for both the sixth optical signal and the seventh optical signal. To eliminate the presence of residual signals at f0 for the sixth and seventh optical signals, the present application introduces a third optical signal.

Specifically, the power adjuster 105 and the phase shifter 106 are respectively configured to perform power adjustment and phase shifting on the third optical signal, and output an eighth optical signal. The second light splitting section 107 is for splitting the eighth optical signal into a ninth optical signal and a tenth optical signal. The second optical coupler 108 is configured to multiplex the sixth optical signal and the ninth optical signal, output an eleventh optical signal with a frequency f0+ f, and cancel a residual signal of the sixth optical signal at the f 0; the third optical coupler 109 is configured to combine the seventh optical signal and the tenth optical signal, output a twelfth optical signal having a frequency f0-f, and cancel a residual signal of the seventh optical signal at f 0.

Wherein the power regulator 105 may be an attenuator. The second light splitting part 107 may be a one-input two-output coupler, i.e., a 1X2 coupler, and the 1X2 coupler may split the eighth optical signal into a ninth optical signal and a tenth optical signal. Wherein the power of the residual signal at f0 of the ninth optical signal and the sixth optical signal is the same and the phase is opposite. Similarly, the power of the residual signal at f0 is the same and the phase of the resultant tenth optical signal is opposite to that of the seventh optical signal. Further, the second optical coupler 108 is configured to combine the sixth optical signal and the ninth optical signal, output an eleventh optical signal with a frequency f0+ f, and cancel a residual signal of the sixth optical signal at f0, as shown in fig. 1, where the eleventh optical signal has a spectral structure with a dominant line spectrum and a frequency f. Similarly, the third optical coupler 109 is configured to combine the seventh optical signal and the tenth optical signal, output a twelfth optical signal having a frequency f0-f, and cancel a residual signal of the seventh optical signal at f0, where the twelfth optical signal has a spectral structure with a dominant linear spectrum and a frequency-f, as shown in fig. 1.

The present application provides a light device, comprising: the optical coupler comprises a first light splitting part, a first MZ modulator, a second MZ modulator, a first optical coupler, a power regulator, a phase shifter, a second light splitting part, a second optical coupler and a third optical coupler, wherein the first light splitting part is used for splitting a light source with the frequency f0 to form at least three optical signals, and the at least three optical signals comprise: a first optical signal, a second optical signal, and a third optical signal; the first MZ modulator is used for driving the first optical signal according to a first clock signal cos (2 pi ft) so as to modulate the first optical signal and output a fourth optical signal; the second MZ modulator is used for driving the second optical signal according to a second clock signal sin (2 pi ft) to modulate the second optical signal and output a fifth optical signal; the first optical coupler is used for coupling the fourth optical signal and the fifth optical signal and outputting a sixth optical signal and a seventh optical signal; the power regulator and the phase shifter are respectively used for carrying out power regulation and phase shifting on the third optical signal and outputting an eighth optical signal; a second optical splitting section for splitting the eighth optical signal into a ninth optical signal and a tenth optical signal; the second optical coupler is used for multiplexing the sixth optical signal and the ninth optical signal, outputting an eleventh optical signal with the frequency of f0+ f, and canceling a residual signal of the sixth optical signal at the f 0; the third optical coupler is configured to combine the seventh optical signal and the tenth optical signal, output a twelfth optical signal having a frequency f0-f, and cancel a residual signal of the seventh optical signal at the f 0. Thereby improving the quality of the output signal.

Example two

On the basis of the first embodiment, the optical device may be a multi-carrier generator, a modulator, and a transmitter, and specifically, fig. 2 is a schematic structural diagram of the optical device provided in the second embodiment of the present application, where the optical device further includes a first modulator 110, a second modulator 111, and a fourth optical coupler 112. Optionally, the optical device further comprises a first amplifier 113 and a second amplifier 114. Wherein the optical devices comprise devices each having at least one input and at least one output. The output end of the second optical coupler 108 is connected to the input end of a first amplifier 113, the output end of the first amplifier 113 is connected to the input end of a first modulator 110, the output end of the third optical coupler 109 is connected to the input end of a second amplifier 114, the output end of the second amplifier 114 is connected to the input end of a second modulator 111, and the output end of the first modulator 110 and the output end of the second modulator 111 are both connected to the input end of a fourth optical coupler 112.

Alternatively, first Modulator 110 and second Modulator 111 may each be a Dual-Polarization In-phase Quadrature Modulator (DP-IQMz). The fourth optical coupler 112 may be a one-input two-output coupler, i.e., a 1x2 coupler.

Wherein the first modulator 110 is used to modulate the eleventh optical signal when the optical device does not comprise the first amplifier 113 and the second amplifier 114. The second modulator 111 is used to modulate the twelfth optical signal. The fourth optical coupler 112 is configured to couple the modulated eleventh optical signal and the modulated twelfth optical signal into a thirteenth optical signal, and output the thirteenth optical signal. When the optical device includes the first amplifier 113 and the second amplifier 114, the first modulator 110 is configured to modulate the eleventh optical signal amplified by the first amplifier 113. The second modulator 111 is used for modulating the twelfth optical signal amplified by the second amplifier 114. The fourth optical coupler 112 is configured to couple the modulated eleventh optical signal and the modulated twelfth optical signal into a thirteenth optical signal, and output the thirteenth optical signal. As shown in fig. 2, the thirteenth optical signal is spectrally composed of upper and lower sidebands (i.e., the modulated eleventh optical signal and the modulated twelfth optical signal).

The application provides an optical device, which can multiplex a sixth optical signal and a ninth optical signal, output an eleventh optical signal with a frequency of f0+ f, and cancel a residual signal of the sixth optical signal at the f 0; and multiplexing the seventh optical signal and the tenth optical signal, outputting a twelfth optical signal with the frequency f0-f, and canceling a residual signal of the seventh optical signal at the f 0. And the modulated eleventh optical signal and the modulated twelfth optical signal are coupled into a thirteenth optical signal, so that the quality of an output signal is improved.

EXAMPLE III

On the basis of the first embodiment, the optical device may be a multi-carrier generator, a modulator, a transmitter. Specifically, fig. 3 is a schematic structural diagram of an optical device provided in the third embodiment of the present application, where the at least three optical signals formed by the first optical splitting portion 101 further include: a fourteenth optical signal, based on which the optical device further comprises a third modulator 115, a fourth modulator 116, a fifth modulator 117 and a fifth optical coupler 118. Optionally, the optical device further comprises a third amplifier 119 and a fourth amplifier 120. Wherein the optical devices comprise devices each having at least one input and at least one output. The output of the second optical coupler 108 is connected to the input of a third amplifier 119, the output of the third amplifier 119 is connected to the input of a third modulator 115, the output of the third optical coupler 109 is connected to the input of a fourth amplifier 120, the output of the fourth amplifier 120 is connected to the input of a fourth modulator 116, an output of the first light splitting section 101 is connected to the input of a fifth modulator 117, and the output of the third modulator 115, the output of the fourth modulator 116, and the output of the fifth modulator 117 are connected to the input of a fifth optical coupler 118.

Wherein the third modulator 115 is configured to modulate the eleventh optical signal when the optical device does not include the third amplifier 119 and the fourth amplifier 120; a fourth modulator 116 is used for modulating the twelfth optical signal; the fifth modulator 117 is configured to modulate the fourteenth optical signal; the fifth optical coupler 118 is configured to couple the modulated eleventh optical signal, the modulated twelfth optical signal, and the modulated fourteenth optical signal into a fifteenth optical signal, and output the fifteenth optical signal. When the optical device includes the third amplifier 119 and the fourth amplifier 120, the third modulator 115 is configured to modulate the eleventh optical signal amplified by the third amplifier 119; the fourth modulator 116 is configured to modulate the twelfth optical signal amplified by the fourth amplifier 120; the fifth modulator 117 is configured to modulate the fourteenth optical signal; the fifth optical coupler 118 is configured to couple the modulated eleventh optical signal, the modulated twelfth optical signal, and the modulated fourteenth optical signal into a fifteenth optical signal, and output the fifteenth optical signal. As shown in fig. 3, the fifteenth optical signal formed by the final coupling can be divided into three sub-carriers as viewed in the spectrum. Since the three subcarriers are formed by independently modulating the third modulator 115, the fourth modulator 116, and the fifth modulator 117, any manner of multicarrier modulation can be implemented, as shown in fig. 3, the three subcarriers may be orthogonally arranged, may be overlapped with non-orthogonal arrangement, and may also be modulated into subcarriers with different rates, thereby implementing Flexible and arbitrary Flexible modulation.

The application provides an optical device, wherein the optical device can multiplex a sixth optical signal and a ninth optical signal, output an eleventh optical signal with a frequency of f0+ f, and cancel a residual signal of the sixth optical signal at the f 0; and multiplexing the seventh optical signal and the tenth optical signal, outputting a twelfth optical signal with the frequency f0-f, and canceling a residual signal of the seventh optical signal at the f 0. And coupling the modulated eleventh optical signal, the modulated twelfth optical signal and the modulated fourteenth optical signal into a fifteenth optical signal, thereby improving the quality of the output signal. Further, the fifteenth optical signal formed by the final coupling may be divided into three subcarriers. Since the three subcarriers are formed by independently modulating the third modulator, the fourth modulator and the fifth modulator, any mode of multicarrier modulation can be realized, and Flexible and arbitrary flexile modulation can be realized.

Example four

On the basis of the first embodiment, the optical device may be a multi-carrier generator, a modulator, a receiver. Specifically, fig. 4 is a schematic structural diagram of an optical device provided in the fourth embodiment of the present application, and as shown in fig. 4, the optical device further includes: a first Integrated Coherent Receiver (ICR) 121, a first Analog to Digital Converter (ADC) 122, a second ICR123, a second ADC124, and a processor 125. Wherein the optical devices comprise devices each having at least one input and at least one output. The output of the second optical coupler 108 is connected to the input of the first ICR121, the output of the first ICR121 is connected to the input of the first ADC122, the output of the first ADC122 is connected to the processor 125, the output of the third optical coupler 109 is connected to the input of the second ICR123, the output of the second ICR123 is connected to the input of the second ADC124, and the output of the second ADC124 is connected to the processor 125.

Specifically, the first ICR121 is configured to receive the first optical carrier, and perform coherent detection on the eleventh optical signal and the first optical carrier to obtain a first coherent detection signal. The coherent detection method related to the present application is the prior art, and is not described herein again. The first ADC122 is configured to perform analog-to-digital conversion on the first coherent detection signal to obtain a first digital signal. The second ICR123 is configured to receive a second optical carrier, and perform coherent detection on the twelfth optical signal and the second optical carrier to obtain a second coherent detection signal; the second ADC124 is configured to perform analog-to-digital conversion on the second coherent detection signal to obtain a second digital signal; the processor 125 is configured to process the first digital signal and the second digital signal. The Processor 125 may be a Digital Signal Processing (DSP), a Central Processing Unit (CPU), a Micro Control Unit (MCU), or the like, which is not limited in this application.

The application provides an optical device, wherein an eleventh optical signal and a twelfth optical signal which are output can be used as local oscillation light sources of a first ICR and a second ICR respectively, the first ICR and the second ICR receive two carriers respectively and independently, coherent detection is carried out on the corresponding carrier and the local oscillation light source, coherent detection signals are output to a first ADC and a second ADC respectively, the first ADC and the second ADC carry out analog-to-digital conversion on the corresponding coherent detection signals respectively to obtain a first digital signal and a second digital signal, a processor can independently process the first digital signal and the second digital signal and can also process the first digital signal and the second digital signal jointly to obtain the beneficial effect of eliminating mutual crosstalk between the two carriers with frequencies of f0-f and f0+ f.

EXAMPLE five

On the basis of the fourth embodiment, further, the at least three optical signals formed by the first optical splitting section 101 further include: a sixteenth optical signal based on which the optical device further comprises a third ICR and a third ADC. Wherein the optical devices comprise devices each having at least one input and at least one output. Specifically, fig. 5 is a schematic structural diagram of the optical device according to the fifth embodiment of the present application, as shown in fig. 5, an output end of the optical splitter 101 is connected to an input end of a third ICR126, an output end of the third ICR126 is connected to an input end of a third ADC127, and an output end of the third ADC127 is connected to the processor 125.

Specifically, the third ICR126 is configured to receive a third optical carrier, and perform coherent detection on the sixteenth optical signal and the third optical carrier to obtain a third coherent detection signal; the third ADC127 is configured to perform analog-to-digital conversion on the third phase interference detection signal to obtain a third digital signal; processor 125 is also configured to process the third digital signal. The processor can independently process the first digital signal, the second digital signal and the third digital signal, and can also process the first digital signal, the second digital signal and the third digital signal jointly.

The application provides an optical device, wherein an eleventh optical signal, a twelfth optical signal and a sixteenth optical signal which are output can be used as local oscillation light sources of a first ICR, a second ICR and a third ICR respectively, the first ICR, the second ICR and the third ICR receive three carriers respectively and independently, coherent detection is carried out on corresponding carriers and the local oscillation light sources, coherent detection signals are output to a first ADC, a second ADC and a third ADC respectively, the first ADC, the second ADC and the third ADC carry out analog-to-digital conversion on the corresponding coherent detection signals respectively to obtain a first digital signal, a second digital signal and a third digital signal, a processor can independently process the first digital signal, the second digital signal and the third digital signal, and can also process the first digital signal, the second digital signal and the third digital signal jointly to obtain a beneficial effect of eliminating mutual crosstalk among certain carriers.

EXAMPLE six

Fig. 6 is a schematic structural diagram of an optical device provided in sixth embodiment of the present application, where the optical device may be a multi-carrier generator, a modulator, a transmitter, a receiver, or the like, which is not limited in this application. The optical device includes: a first optical splitting section 601, a first MZ modulator 602, a second MZ modulator 603, a first optical coupler 604, a second optical splitting section 605, a first power adjuster 606, a first phase shifter 607, a second power adjuster 608, a second phase shifter 609, a second optical coupler 610, and a third optical coupler 611. Each of these devices has at least one input and at least one output.

The input end of the first light splitting part 601 is used for acquiring a light source generated by a laser. A plurality of output terminals of the first optical splitting section 601 are connected to an input terminal of the first MZ modulator 602, an input terminal of the second MZ modulator 603, and an input terminal of the second optical splitting section 605, respectively. The output of the first MZ modulator 602 and the output of the second MZ modulator 603 are connected to the input of the first optical coupler 604, respectively. Two output terminals of the first optical coupler 604 are connected to an input terminal of the second optical coupler 610 and an input terminal of the third optical coupler 611, respectively. Two output terminals of the second dichroic portion 605 are connected to an input terminal of the first power conditioner 606 and an input terminal of the second power conditioner 608, respectively, an output terminal of the first power conditioner 606 is connected to an input terminal of the first phase shifter 607, and an output terminal of the first phase shifter 607 is connected to an input terminal of the second optical coupler 610. An output of the second power regulator 608 is connected to an input of a second phase shifter 609, and an output of the second phase shifter 609 is connected to an input of a third optical coupler 611.

Specifically, the first light splitting part 601 is configured to split a light source with a frequency f0 to form at least three optical signals, where the at least three optical signals include: a first optical signal, a second optical signal, and a third optical signal. The first light splitting part 601 may be an optical coupler, an optical splitter, or the like, which is not limited in the present application. The first light splitting part 101 forms at least three optical signals, which are all optical signals with frequency f 0.

The first MZ modulator 602 is configured to drive the first optical signal according to a first clock signal cos (2 pi ft) to modulate the first optical signal and output a fourth optical signal, where f is a frequency of the first clock signal. And a second MZ modulator 603 configured to drive the second optical signal according to the second clock signal sin (2 π ft) to modulate the second optical signal and output a fifth optical signal, where the frequencies of the first clock signal and the second clock signal are both f.

As described above, the first optical signal and the second optical signal enter the first MZ modulator 602 and the second MZ modulator 603, respectively. The first clock signal cos (2 pi ft) is used for driving the first optical signal to modulate the first optical signal and output a fourth optical signal, f represents the frequency of the first clock signal, and t represents time. As shown in fig. 6, the fourth optical signal output from the first MZ modulator 602 includes three spectral structures with a line spectrum as the main component, the middle line spectrum is the residual signal of the fourth optical signal at f0, the two line spectrums represent the effective signal of the fourth optical signal, and the frequencies of the two line spectrums are f0-f and f0+ f, respectively. The first optical signal equivalent to one wavelength is modulated by the first MZ modulator to obtain a fourth optical signal, which includes optical signals of two wavelengths and a residual signal at f0, wherein the frequency interval of the optical signals of the two wavelengths is 2 f.

The second clock signal sin (2 π ft) is used to drive the second optical signal to modulate the second optical signal and output a fifth optical signal, f represents the frequency of the second clock signal, and t represents time. The first clock signal and the second clock signal have the same frequency, and are both f. As shown in fig. 6, the fifth optical signal output from the second MZ modulator 603 includes a spectral structure with three line spectrums as main, the middle line spectrum is a residual signal of the fifth optical signal at f0, the line spectrums at two sides represent effective signals of the fifth optical signal, and the frequencies of the line spectrums at two sides are f0-f and f0+ f, respectively. The second optical signal equivalent to one wavelength is modulated by the second MZ modulator to obtain a fifth optical signal, which includes the optical signals of two wavelengths and the residual signal at f0, wherein the frequency interval of the optical signals of two wavelengths is 2 f.

Optionally, the first clock signal and the second clock signal are generated by two clock sources that are phase synchronized. Alternatively, the first clock signal and the second clock signal are generated by the same clock source, for example: as shown in fig. 6, the first clock signal and the second clock signal are generated by the same clock source, and the second clock signal can be obtained by phase-shifting 1/4 cycles of the first clock signal by the clock source driving the first clock signal. Alternatively, the first clock signal and the second clock signal are generated by the same clock source.

The first optical coupler 604 is configured to couple the fourth optical signal and the fifth optical signal and output a sixth optical signal and a seventh optical signal. The first optical coupler 604 may be a two-input two-output optical coupler, i.e., a 2X2 coupler, and the jones matrix of the 2X2 coupler is

The 2X2 coupler couples the fourth optical signal and the fifth optical signal through the jones matrix, and outputs a sixth optical signal and a seventh optical signal. Wherein the sixth optical signal includes: the effective signal cos (2 π ft) + j · sin (2 π ft) ═ e^j2πftAnd, the residual signal of the sixth optical signal at f0, as shown in fig. 6, the sixth optical signal includes two spectral structures with dominant line spectra, the left line spectrum is the residual signal of the sixth optical signal at f0, and the right line spectrum represents the effective signal cos (2 pi ft) + j · sin (2 pi ft) ═ e) of the sixth optical signal^j2πftThe frequencies are f0+ f, respectively. Correspond toAnd, the seventh optical signal comprises: the valid signal cos (2 π ft) -j · sin (2 π ft) ═ j · e^-j2πftAnd, the residual signal of the seventh optical signal at f 0. As shown in fig. 6, the seventh optical signal includes two spectral structures in which the line spectra are dominant, and the line spectrum on the left side represents the effective signal cos (2 pi ft) -j · sin (2 pi ft) -j · e of the seventh optical signal^-j2πftThe frequencies are f0-f, respectively. The line spectrum on the right represents the residual signal of the seventh optical signal at f 0.

Specifically, the second optical splitting section 605 is configured to split the third optical signal into an eighth optical signal and a ninth optical signal. The first power adjuster 606 and the first phase shifter 607 are configured to perform power adjustment and phase shift on the eighth optical signal, and output a tenth optical signal. The second power adjuster 608 and the second phase shifter 609 are configured to perform power adjustment and phase shifting on the ninth optical signal, and output an eleventh optical signal.

The second optical coupler 610 is configured to multiplex the sixth optical signal and the tenth optical signal, output a twelfth optical signal with a frequency f0+ f, and cancel a residual signal of the sixth optical signal at the f 0; the third optical coupler 611 is configured to multiplex the seventh optical signal and the eleventh optical signal, output a thirteenth optical signal with a frequency f0-f, and cancel a residual signal of the seventh optical signal at the f 0.

Wherein both the first power regulator 606 and the second power regulator 608 may be attenuators. The second light splitting part 605 may be a one-input two-output coupler, i.e., a 1X2 coupler, and the 1X2 coupler may split the third optical signal into an eighth optical signal and a ninth optical signal. The first power adjuster 606 and the first phase shifter 607 are configured to perform power adjustment and phase shift on the eighth optical signal, and output a tenth optical signal. The second power adjuster 608 and the second phase shifter 609 are configured to perform power adjustment and phase shifting on the ninth optical signal, and output an eleventh optical signal. Wherein the power of the residual signal at f0 of the resultant tenth optical signal and the sixth optical signal are the same and the phases are opposite. Similarly, the power of the residual signal at f0 of the eleventh optical signal and the seventh optical signal is the same, and the phases are opposite. Further, the second optical coupler 610 is configured to combine the sixth optical signal and the tenth optical signal, output a twelfth optical signal having a frequency f0+ f, and cancel a residual signal of the sixth optical signal at f0, as shown in fig. 6, where the twelfth optical signal has a spectral structure with a dominant line spectrum and a frequency f. Similarly, the third optical coupler 611 is configured to multiplex the seventh optical signal and the eleventh optical signal, output a thirteenth optical signal having a frequency f0-f, and cancel a residual signal of the seventh optical signal at f0, as shown in fig. 6, where the thirteenth optical signal has a spectral structure with a linear spectrum as a main component and the frequency of the linear spectrum is-f.

The present application provides a light device, comprising: the first optical coupler, the second optical coupler, the third optical coupler, the first phase shifter, the second optical coupler and the third optical coupler. The first light splitting part is used for splitting a light source with the frequency f0 to form at least three optical signals, and the at least three optical signals comprise: a first optical signal, a second optical signal, and a third optical signal; the first MZ modulator is used for driving the first optical signal according to the first clock signal cos (2 pi ft) so as to modulate the first optical signal and output a fourth optical signal; the second MZ modulator is used for driving a second optical signal according to a second clock signal sin (2 pi ft) to modulate the second optical signal and output a fifth optical signal; the first optical coupler is used for coupling the fourth optical signal and the fifth optical signal and outputting a sixth optical signal and a seventh optical signal; the second light splitting part is used for splitting the third optical signal into an eighth optical signal and a ninth optical signal; the first power regulator and the first phase shifter are used for carrying out power regulation and phase shifting on the eighth optical signal and outputting a tenth optical signal; the second power regulator and the second phase shifter are used for carrying out power regulation and phase shifting on the ninth optical signal and outputting an eleventh optical signal; the second optical coupler is used for multiplexing the sixth optical signal and the tenth optical signal, outputting a twelfth optical signal with the frequency of f0+ f, and canceling a residual signal of the sixth optical signal at f 0; the third optical coupler is used for multiplexing the seventh optical signal and the eleventh optical signal, outputting a thirteenth optical signal with the frequency f0-f, and canceling a residual signal of the seventh optical signal at f 0. Thereby improving the quality of the output signal.

EXAMPLE seven

On the basis of the sixth embodiment, the optical device may be a multi-carrier generator, a modulator, and a transmitter, and specifically, fig. 7 is a schematic structural diagram of the optical device provided in the seventh embodiment of the present application, where the optical device further includes a first modulator 612, a second modulator 613, and a fourth optical coupler 614. Optionally, the optical device further comprises a first amplifier 615 and a second amplifier 616. Wherein the optical devices comprise devices each having at least one input and at least one output. The output of the second optical coupler 610 is connected to the input of the first amplifier 615, the output of the first amplifier 615 is connected to the input of the first modulator 612, the output of the third optical coupler 611 is connected to the input of the second amplifier 616, the output of the second amplifier 616 is connected to the input of the second modulator 613, and the outputs of the first modulator 612 and the second modulator 613 are both connected to the input of the fourth optical coupler 614.

Wherein the first modulator 612 is configured to modulate the twelfth optical signal when the optical device does not include the first amplifier 615 and the second amplifier 616. The second modulator 613 is used for modulating the thirteenth optical signal. The fourth optical coupler 614 is configured to couple the modulated twelfth optical signal and the modulated thirteenth optical signal into a fourteenth optical signal and output the fourteenth optical signal. When the optical device includes the first amplifier 615 and the second amplifier 616, the first modulator 612 is used to modulate the twelfth optical signal amplified by the first amplifier 615. The second modulator 613 is used for modulating the thirteenth optical signal amplified by the second amplifier 616. The fourth optical coupler 614 is configured to couple the modulated twelfth optical signal and the modulated thirteenth optical signal into a fourteenth optical signal and output the fourteenth optical signal. As shown in fig. 6, the fourteenth optical signal is composed of the upper and lower sidebands (i.e., the modulated twelfth optical signal and the modulated thirteenth optical signal) in the spectrum view.

Optionally, the first modulator 612 and the second modulator 613 may each be a dual polarization IQ modulator. The fourth optical coupler 614 may be a one-input two-output coupler, i.e., a 1x2 coupler.

The application provides an optical device, which can combine a sixth optical signal and a tenth optical signal, output a twelfth optical signal with a frequency of f0+ f, and cancel a residual signal of the sixth optical signal at the f 0; and multiplexing the seventh optical signal and the eleventh optical signal, outputting a thirteenth optical signal with the frequency of f0-f, and canceling a residual signal of the seventh optical signal at the f 0. And the twelfth optical signal and the thirteenth optical signal after modulation are coupled into a fourteenth optical signal, so that the quality of an output signal is improved.

Example eight

On the basis of the sixth embodiment, the optical device may be a multicarrier generator, a modulator, a transmitter. Specifically, fig. 8 is a schematic structural diagram of an optical device according to an eighth embodiment of the present application, where the at least three optical signals formed by the first optical splitting portion 601 further include: the fifteenth optical signal, based on which the optical device further comprises a third modulator 617, a fourth modulator 618, a fifth modulator 619 and a fifth optical coupler 620. Optionally, the optical device further comprises a third amplifier 621 and a fourth amplifier 622. Wherein the optical devices comprise devices each having at least one input and at least one output. The output of the second optical coupler 610 is connected to the input of a third amplifier 621, the output of the third amplifier 621 is connected to the input of a third modulator 617, the output of the third optical coupler 611 is connected to the input of a fourth amplifier 622, the output of the fourth amplifier 622 is connected to the input of a fourth modulator 618, an output of the first optical splitting section 601 is connected to the input of a fifth modulator 619, and the output of the third modulator 617, the output of the fourth modulator 618 and the output of the fifth modulator 619 are all connected to the input of a fifth optical coupler 620.

Wherein, when the optical device does not include the third amplifier 621 and the fourth amplifier 622, the third modulator 617 is configured to modulate the twelfth optical signal; a fourth modulator 618 for modulating the thirteenth optical signal; a fifth modulator 619 for modulating the fifteenth optical signal; the fifth optical coupler 620 is configured to couple the modulated twelfth optical signal, the modulated thirteenth optical signal, and the modulated fifteenth optical signal into a sixteenth optical signal, and output the sixteenth optical signal. When the optical device includes the third amplifier 621 and the fourth amplifier 622, the third modulator 617 is configured to modulate the twelfth optical signal amplified by the third amplifier 621; a fourth modulator 618 for modulating the thirteenth optical signal amplified by a fourth amplifier 622; a fifth modulator 619 for modulating the fifteenth optical signal; the fifth optical coupler 620 is configured to couple the modulated twelfth optical signal, the modulated thirteenth optical signal, and the modulated fifteenth optical signal into a sixteenth optical signal, and output the sixteenth optical signal. As shown in fig. 8, the sixteenth optical signal formed by the final coupling can be divided into three sub-carriers as viewed in spectrum. Since the three subcarriers are independently modulated by the third modulator 617, the fourth modulator 618 and the fifth modulator 619, multicarrier modulation in any mode can be realized, as shown in fig. 8, the three subcarriers may be orthogonally arranged, may be overlapped with non-orthogonal arrangement, and may also be modulated into subcarriers with different rates, thereby realizing Flexible and arbitrary Flexible modulation.

The application provides an optical device, wherein the optical device can multiplex a sixth optical signal and a tenth optical signal, output a twelfth optical signal with a frequency of f0+ f, and cancel a residual signal of the sixth optical signal at the f 0; and multiplexing the seventh optical signal and the eleventh optical signal, outputting a thirteenth optical signal with the frequency of f0-f, and canceling a residual signal of the seventh optical signal at the f 0. And the modulated twelfth optical signal, the modulated thirteenth optical signal and the modulated fifteenth optical signal are coupled into a sixteenth optical signal, so that the quality of an output signal is improved. Further, the sixteenth optical signal formed by the final coupling may be divided into three subcarriers. Since the three subcarriers are formed by independently modulating the third modulator, the fourth modulator and the fifth modulator, any mode of multicarrier modulation can be realized, and Flexible and arbitrary flexile modulation can be realized.

Example nine

On the basis of the sixth embodiment, the optical device may be a multicarrier generator, a modulator, or a receiver. Specifically, fig. 9 is a schematic structural diagram of an optical device according to the ninth embodiment of the present application, and as shown in fig. 9, the optical device further includes: a first ICR623, a first ADC624, a second ICR625, a second ADC626, and a processor 627. Wherein the optical devices comprise devices each having at least one input and at least one output. The output of the second optocoupler 610 is connected to the input of the first ICR623, the output of the first ICR623 is connected to the input of the first ADC624, the output of the first ADC624 is connected to the processor 627, the output of the third optocoupler 611 is connected to the input of the second ICR625, the output of the second ICR625 is connected to the input of the second ADC626, and the output of the second ADC626 is connected to the processor 627.

Specifically, the first ICR623 is configured to receive the first optical carrier, and perform coherent detection on the twelfth optical signal and the first optical carrier to obtain a first coherent detection signal. The coherent detection method related to the present application is the prior art, and is not described herein again. The second ADC626 is configured to perform analog-to-digital conversion on the first coherent detection signal to obtain a first digital signal. The second ICR625 is configured to receive a second optical carrier, and perform coherent detection on a thirteenth optical signal and the second optical carrier to obtain a second coherent detection signal; the second ADC626 is configured to perform analog-to-digital conversion on the second coherent detection signal to obtain a second digital signal; processor 627 is configured to process the first digital signal and the second digital signal. The processor 125 may be a DSP, a CPU, an MCU, or the like, which is not limited in this application.

The application provides an optical device, wherein a twelfth optical signal and a thirteenth optical signal which are output can be used as local oscillation light sources of a first ICR and a second ICR respectively, the first ICR and the second ICR receive two carriers respectively and independently, coherent detection is carried out on the corresponding carrier and the local oscillation light source, coherent detection signals are output to a first ADC and a second ADC respectively, the first ADC and the second ADC carry out analog-to-digital conversion on the corresponding coherent detection signals respectively to obtain a first digital signal and a second digital signal, a processor can independently process the first digital signal and the second digital signal and can also process the first digital signal and the second digital signal jointly to obtain the beneficial effect of eliminating mutual crosstalk between certain carriers.

Example ten

On the basis of the ninth embodiment, further, the at least three optical signals formed by the first optical splitting section 601 further include: a seventeenth optical signal, based on which the optical device further comprises a third ICR and a third ADC. Wherein the optical devices comprise devices each having at least one input and at least one output. Specifically, fig. 10 is a schematic structural diagram of an optical device according to a tenth embodiment of the present disclosure, as shown in fig. 10, an output terminal of the optical splitter 601 is connected to an input terminal of a third ICR628, an output terminal of the third ICR628 is connected to an input terminal of a third ADC629, and an output terminal of the third ADC629 is connected to the processor 627.

Specifically, the third ICR62 is configured to receive a third optical carrier, and perform coherent detection on the seventeenth optical signal and the third optical carrier to obtain a third coherent detection signal; the third ADC629 is configured to perform analog-to-digital conversion on the third phase interference detection signal to obtain a third digital signal; processor 627 is also for processing the third digital signal. The processor can independently process the first digital signal, the second digital signal and the third digital signal, and can also process the first digital signal, the second digital signal and the third digital signal jointly.

The application provides an optical device, wherein a twelfth optical signal, a thirteenth optical signal and a seventeenth optical signal which are output can be used as local oscillation light sources of a first ICR, a second ICR and a third ICR respectively, the first ICR, the second ICR and the third ICR receive three carriers respectively and independently, coherent detection is carried out on corresponding carriers and the local oscillation light sources, coherent detection signals are output to a first ADC, a second ADC and a third ADC respectively, the first ADC, the second ADC and the third ADC carry out analog-to-digital conversion on the corresponding coherent detection signals respectively to obtain a first digital signal, a second digital signal and a third digital signal, a processor can independently process the first digital signal, the second digital signal and the third digital signal, and can also process the first digital signal, the second digital signal and the third digital signal jointly to obtain a beneficial effect of eliminating mutual crosstalk among certain carriers.

EXAMPLE eleven

Fig. 11 is a flowchart of an optical signal processing method according to an embodiment of the present application, where an execution subject of the method is an optical device, and the optical device may be a multi-carrier generator, a modulator, a transmitter, a receiver, or the like, which is not limited in this respect, and as shown in fig. 11, the method includes the following steps:

step S1101: splitting a light source with the frequency f0 to form at least three optical signals, wherein the at least three optical signals include: a first optical signal, a second optical signal, and a third optical signal;

step S1102: driving the first optical signal according to the first clock signal to modulate the first optical signal to obtain a fourth optical signal, wherein f is the frequency of the first clock signal;

step S1103: driving a second optical signal according to a second clock signal to modulate the second optical signal to obtain a fifth optical signal;

wherein the first clock signal is cos (2 π ft). The second clock signal is sin (2 π ft).

Step S1104: coupling the fourth optical signal and the fifth optical signal to obtain a sixth optical signal and a seventh optical signal;

step S1105: carrying out power regulation and phase shifting on the third optical signal to obtain an eighth optical signal;

step S1106: dividing the eighth optical signal into a ninth optical signal and a tenth optical signal;

step S1107: combining the sixth optical signal and the ninth optical signal to obtain an eleventh optical signal with the frequency of f0+ f, and canceling a residual signal of the sixth optical signal at f 0;

step S1108: and combining the seventh optical signal and the tenth optical signal to obtain a twelfth optical signal with the frequency of f0-f, and canceling the residual signal of the seventh optical signal at f 0.

The optical signal processing method can be executed by the optical device described in the first embodiment, and the content and effect thereof are not described herein again.

Example twelve

Fig. 12 is a flowchart of an optical signal processing method according to another embodiment of the present application, and as shown in fig. 12, after step S1108 of the eleventh embodiment, the optical signal processing method further includes:

step S1109 a: modulating the eleventh optical signal;

step S1110 a: modulating the twelfth optical signal;

step S1111 a: and coupling the modulated eleventh optical signal and the modulated twelfth optical signal into a thirteenth optical signal, and outputting the thirteenth optical signal.

The optical signal processing method can be executed by the optical device described in the second embodiment, and the content and effect thereof are not described herein again.

EXAMPLE thirteen

Fig. 13 is a flowchart of an optical signal processing method according to yet another embodiment of the present application, where the at least three optical signals further include: fourteenth optical signal, as shown in fig. 13, after step S1108 of the eleventh embodiment, the optical signal processing method further includes:

step S1109 b: modulating the eleventh optical signal;

step S1110 b: modulating the twelfth optical signal;

step S1111 b: modulating the fourteenth optical signal;

step S1112 b: and coupling the modulated eleventh optical signal, the modulated twelfth optical signal and the modulated fourteenth optical signal into a fifteenth optical signal, and outputting the fifteenth optical signal.

The optical signal processing method can be executed by the optical device described in the third embodiment, and the content and effect thereof are not described herein again.

Example fourteen

Fig. 14 is a flowchart of an optical signal processing method according to yet another embodiment of the present application, and as shown in fig. 14, after step S1108 of the eleventh embodiment, the optical signal processing method further includes:

step S1109 c: receiving a first optical carrier, and performing coherent detection on the eleventh optical signal and the first optical carrier to obtain a first coherent detection signal;

step S1110 c: performing analog-to-digital conversion on the first coherent detection signal to obtain a first digital signal;

step S1111 c: receiving a second optical carrier, and performing coherent detection on the twelfth optical signal and the second optical carrier to obtain a second coherent detection signal;

step S1112 c: performing analog-to-digital conversion on the second coherent detection signal to obtain a second digital signal;

step S1113 c: the first digital signal and the second digital signal are processed.

The optical signal processing method can be executed by the optical device described in the fourth embodiment, and the content and effect thereof are not described herein again.

Example fifteen

Fig. 15 is a flowchart of an optical signal processing method according to yet another embodiment of the present application, where the at least three optical signals further include: sixteenth optical signal, as shown in fig. 15, in addition to the fourteenth embodiment, the optical signal processing method further includes:

step S1114 c: receiving a third optical carrier, and performing coherent detection on the sixteenth optical signal and the third optical carrier to obtain a third coherent detection signal;

step S1115 c: performing analog-to-digital conversion on the third phase interference detection signal to obtain a third digital signal;

step S1116 c: the third digital signal is processed.

It should be noted that step S1113c and step S1116c may be performed independently, that is, the optical device may process the first digital signal, the second digital signal and the third digital signal independently; alternatively, step S1113c and step S1116c may be jointly performed, that is, the optical device may jointly process the first digital signal, the second digital signal and the third digital signal, which is not limited in this application.

The optical signal processing method can be executed by the optical device described in the fifth embodiment, and the content and effect thereof are not described herein again.

Example sixteen

Fig. 16 is a flowchart of an optical signal processing method according to an embodiment of the present application, where an execution subject of the method is an optical device, and the optical device may be a multi-carrier generator, a modulator, a transmitter, a receiver, or the like, which is not limited in this respect, as shown in fig. 16, the method includes the following steps:

step S1601: splitting a light source with a frequency f0 to form at least three optical signals, wherein the at least three optical signals include: a first optical signal, a second optical signal, and a third optical signal;

step S1602: driving the first optical signal according to a first clock signal to modulate the first optical signal to obtain a fourth optical signal, wherein f is the frequency of the first clock signal;

step S1603: driving the second optical signal according to a second clock signal to modulate the second optical signal to obtain a fifth optical signal;

Step S1604: coupling the fourth optical signal and the fifth optical signal to obtain a sixth optical signal and a seventh optical signal;

step S1605: dividing the third optical signal into an eighth optical signal and a ninth optical signal;

step S1606: carrying out power regulation and phase shifting on the eighth optical signal to obtain a tenth optical signal;

step S1607: performing power adjustment and phase shifting on the ninth optical signal to obtain an eleventh optical signal;

step S1608: combining the sixth optical signal and the tenth optical signal to obtain a twelfth optical signal with the frequency of f0+ f, and canceling a residual signal of the sixth optical signal at f 0;

step S1609: and combining the seventh optical signal and the eleventh optical signal to obtain a thirteenth optical signal with the frequency of f0-f, and canceling the residual signal of the seventh optical signal at f 0.

The optical signal processing method can be executed by the optical device of the sixth embodiment, and the content and the effect thereof are not described herein again.

Example seventeen

Fig. 17 is a flowchart of an optical signal processing method according to another embodiment of the present application, and as shown in fig. 17, after step S1609 of the sixteenth embodiment, the optical signal processing method further includes:

step S1610 a: modulating the twelfth optical signal;

step S1611 a: modulating a thirteenth optical signal;

step S1612 a: and coupling the modulated twelfth optical signal and the modulated thirteenth optical signal into a fourteenth optical signal, and outputting the fourteenth optical signal.

The optical signal processing method can be executed by the optical device of the seventh embodiment, and the content and the effect thereof are not described herein again.

EXAMPLE eighteen

Fig. 18 is a flowchart of an optical signal processing method according to yet another embodiment of the present application, where the at least three optical signals further include: fifteenth optical signal, as shown in fig. 18, after step S1609 of the sixteenth embodiment, the optical signal processing method further includes:

step S1610 b: modulating the twelfth optical signal;

step S1611 b: modulating a thirteenth optical signal;

step S1612 b: modulating a fifteenth optical signal;

step S1613 b: and coupling the modulated twelfth optical signal, the modulated thirteenth optical signal and the modulated fifteenth optical signal into a sixteenth optical signal, and outputting the sixteenth optical signal.

The optical signal processing method can be executed by the optical device of the eighth embodiment, and the content and the effect thereof are not described herein again.

Example nineteen

Fig. 19 is a flowchart of an optical signal processing method according to still another embodiment of the present application, and as shown in fig. 19, after step S1609 of the sixteenth embodiment, the optical signal processing method further includes:

step S1610 c: receiving a first optical carrier, and performing coherent detection on the twelfth optical signal and the first optical carrier to obtain a first coherent detection signal;

step S1611 c: performing analog-to-digital conversion on the first coherent detection signal to obtain a first digital signal;

step S1612 c: receiving a second optical carrier, and performing coherent detection on the thirteenth optical signal and the second optical carrier to obtain a second coherent detection signal;

step S1613 c: performing analog-to-digital conversion on the second coherent detection signal to obtain a second digital signal;

step S1614 c: the first digital signal and the second digital signal are processed.

The optical signal processing method can be executed by the optical device according to the ninth embodiment, and the content and the effect thereof are not described herein again.

Example twenty

Fig. 20 is a flowchart of an optical signal processing method according to yet another embodiment of the present application, where the at least three optical signals further include: as shown in fig. 20, in the seventeenth optical signal according to the nineteenth embodiment, the optical signal processing method further includes:

step S1615 c: receiving a third optical carrier, and performing coherent detection on the seventeenth optical signal and the third optical carrier to obtain a third coherent detection signal;

step S1616 c: performing analog-to-digital conversion on the third phase interference detection signal to obtain a third digital signal;

step S1617 c: the third digital signal is processed.

It should be noted that step S1614c and step S1617c may be performed independently, that is, the optical device may process the first digital signal, the second digital signal, and the third digital signal independently; alternatively, step S1614c and step S1617c may be jointly performed, that is, the optical device may jointly process the first digital signal, the second digital signal and the third digital signal, which is not limited in this application.

The optical signal processing method can be executed by the optical device of the tenth embodiment, and the content and effect thereof are not described herein again.

Claims

1. A light device, comprising:

a first light splitting part, configured to split a light source with a frequency f0 to form at least three optical signals, where the at least three optical signals include: a first optical signal, a second optical signal, and a third optical signal;

a first Mach-Zehnder modulator for modulating the first clock signal

Driving the first optical signal to modulate the first optical signal, outputting a fourth optical signal, where f is the frequency of the first clock signal, the fourth optical signal comprising two wavelengths of optical signals and a residual signal at f0, where the two wavelengths of optical signals have a frequency separation of 2 f;

a second MZ modulator for generating a second clock signal

Driving the second optical signal to modulate the second optical signal, outputting a fifth optical signal comprising two wavelengths of optical signals and a residual signal at f0, wherein the two wavelengths of optical signals have a frequency separation of 2 f;

a first optical coupler, configured to couple the fourth optical signal and the fifth optical signal, and output a sixth optical signal and a seventh optical signal;

a second optical splitting section for splitting the eighth optical signal into a ninth optical signal and a tenth optical signal;

a second optical coupler, configured to multiplex the sixth optical signal and the ninth optical signal, output an eleventh optical signal with a frequency f0+ f, and cancel a residual signal of the sixth optical signal at the f 0;

a third optical coupler, configured to combine the seventh optical signal and the tenth optical signal, output a twelfth optical signal with a frequency f0-f, and cancel a residual signal of the seventh optical signal at the f 0.

2. The optical device according to claim 1, wherein the first clock signal and the second clock signal are generated by the same clock source, or wherein the first clock signal and the second clock signal are generated by two clock sources that are phase-synchronized.

3. A light device as claimed in claim 1 or 2, further comprising:

a first modulator for modulating the eleventh optical signal;

a second modulator for modulating the twelfth optical signal;

4. The optical device according to claim 1 or 2, wherein the at least three optical signals further comprise: a fourteenth optical signal, the optical device further comprising:

a third modulator for modulating the eleventh optical signal;

a fourth modulator for modulating the twelfth optical signal;

a fifth modulator for modulating the fourteenth optical signal;

5. A light device as claimed in claim 1 or 2, further comprising:

the first integrated coherent receiver ICR is used for receiving a first optical carrier and performing coherent detection on the eleventh optical signal and the first optical carrier to obtain a first coherent detection signal;

a processor for processing the first digital signal and the second digital signal.

6. The optical device of claim 5, wherein the at least three optical signals further comprise: a sixteenth optical signal, the optical device further comprising:

the processor is further configured to process the third digital signal.

7. A light device, comprising:

a first Mach-Zehnder modulator for modulating the first clock signal

a second MZ modulator for generating a second clock signal

a first power adjuster and a first phase shifter for performing power adjustment and phase shift on the eighth optical signal and outputting a tenth optical signal;

a second optical coupler, configured to combine the sixth optical signal and the tenth optical signal, output a twelfth optical signal with a frequency f0+ f, and cancel a residual signal of the sixth optical signal at the f 0;

and the third optical coupler is used for multiplexing the seventh optical signal and the eleventh optical signal, outputting a thirteenth optical signal with the frequency of f0-f, and canceling a residual signal of the seventh optical signal at the f 0.

8. The optical device according to claim 7, wherein the first clock signal and the second clock signal are generated by the same clock source, or wherein the first clock signal and the second clock signal are generated by two clock sources that are phase-synchronized.

9. The optical device according to claim 7 or 8, further comprising:

a first modulator for modulating the twelfth optical signal;

a second modulator for modulating the thirteenth optical signal;

10. The optical device according to claim 7 or 8, wherein the at least three optical signals further comprise: a fifteenth optical signal, the optical device further comprising:

a third modulator for modulating the twelfth optical signal;

a fourth modulator for modulating the thirteenth optical signal;

a fifth modulator for modulating the fifteenth optical signal;

11. The optical device according to claim 7 or 8, further comprising:

the first integrated coherent receiver ICR is used for receiving a first optical carrier and performing coherent detection on the twelfth optical signal and the first optical carrier to obtain a first coherent detection signal;

the second ICR is configured to receive a second optical carrier, and perform coherent detection on the thirteenth optical signal and the second optical carrier to obtain a second coherent detection signal;

12. The optical device of claim 11, wherein the at least three optical signals further comprise: a seventeenth optical signal, the optical device further comprising:

the processor is further configured to process the third digital signal.

13. An optical signal processing method, comprising:

splitting a light source with a frequency f0 to form at least three optical signals, wherein the at least three optical signals include: a first optical signal, a second optical signal, and a third optical signal;

according to a first clock signal

Driving the first optical signal to modulate the first optical signal to obtain a fourth optical signal, where f is a frequency of the first clock signal, and the fourth optical signalThe optical signal comprises an optical signal at two wavelengths, the frequency separation of which is 2f, and a residual signal at f 0;

according to a second clock signal

Driving the second optical signal to modulate the second optical signal to obtain a fifth optical signal, the fifth optical signal comprising two wavelengths of optical signals and a residual signal at f0, wherein the two wavelengths of optical signals have a frequency separation of 2 f;

coupling the fourth optical signal and the fifth optical signal to obtain a sixth optical signal and a seventh optical signal;

carrying out power regulation and phase shifting on the third optical signal to obtain an eighth optical signal;

splitting the eighth optical signal into a ninth optical signal and a tenth optical signal;

combining the sixth optical signal and the ninth optical signal to obtain an eleventh optical signal with a frequency of f0+ f, and canceling a residual signal of the sixth optical signal at the f 0;

and combining the seventh optical signal and the tenth optical signal to obtain a twelfth optical signal with the frequency of f0-f, and canceling the residual signal of the seventh optical signal at the f 0.

14. The method of claim 13, wherein the first clock signal and the second clock signal are generated from the same clock source, or wherein the first clock signal and the second clock signal are generated from two clock sources that are phase synchronized.

15. The method of claim 13 or 14, further comprising:

modulating the eleventh optical signal;

modulating the twelfth optical signal;

and coupling the modulated eleventh optical signal and the modulated twelfth optical signal into a thirteenth optical signal, and outputting the thirteenth optical signal.

16. The method of claim 13 or 14, wherein the at least three optical signals further comprise: a fourteenth optical signal, the method further comprising:

modulating the eleventh optical signal;

modulating the twelfth optical signal;

modulating the fourteenth optical signal;

and coupling the modulated eleventh optical signal, the modulated twelfth optical signal and the modulated fourteenth optical signal into a fifteenth optical signal, and outputting the fifteenth optical signal.

17. The method of claim 13 or 14, further comprising:

receiving a first optical carrier, and performing coherent detection on the eleventh optical signal and the first optical carrier to obtain a first coherent detection signal;

performing analog-to-digital conversion on the first coherent detection signal to obtain a first digital signal;

receiving a second optical carrier, and performing coherent detection on the twelfth optical signal and the second optical carrier to obtain a second coherent detection signal;

performing analog-to-digital conversion on the second coherent detection signal to obtain a second digital signal;

processing the first digital signal and the second digital signal.

18. The method of claim 17, wherein the at least three optical signals further comprise: a sixteenth optical signal, the method further comprising:

receiving a third optical carrier, and performing coherent detection on the sixteenth optical signal and the third optical carrier to obtain a third coherent detection signal;

performing analog-to-digital conversion on the third phase interference detection signal to obtain a third digital signal;

processing the third digital signal.

19. An optical signal processing method, comprising:

according to a first clock signal

Driving the first optical signal to modulate the first optical signal to obtain a fourth optical signal, wherein f is the frequency of the first clock signal, the fourth optical signal comprises two wavelengths of optical signals and a residual signal at f0, wherein the frequency interval of the two wavelengths of optical signals is 2 f;

according to a second clock signal

dividing the third optical signal into an eighth optical signal and a ninth optical signal;

performing power adjustment and phase shift on the eighth optical signal to obtain a tenth optical signal;

performing power adjustment and phase shifting on the ninth optical signal to obtain an eleventh optical signal;

combining the sixth optical signal and the tenth optical signal to obtain a twelfth optical signal with a frequency of f0+ f, and canceling a residual signal of the sixth optical signal at the f 0;

and combining the seventh optical signal and the eleventh optical signal to obtain a thirteenth optical signal with the frequency of f0-f, and canceling the residual signal of the seventh optical signal at the f 0.

20. The method of claim 19, wherein the first clock signal and the second clock signal are generated from the same clock source, or wherein the first clock signal and the second clock signal are generated from two clock sources that are phase synchronized.

21. The method of claim 19 or 20, further comprising:

modulating the twelfth optical signal;

modulating the thirteenth optical signal;

and coupling the modulated twelfth optical signal and the modulated thirteenth optical signal into a fourteenth optical signal, and outputting the fourteenth optical signal.

22. The method of claim 19 or 20, wherein the at least three optical signals further comprise: a fifteenth optical signal, the method further comprising:

modulating the twelfth optical signal;

modulating the thirteenth optical signal;

modulating the fifteenth optical signal;

and coupling the modulated twelfth optical signal, the modulated thirteenth optical signal and the modulated fifteenth optical signal into a sixteenth optical signal, and outputting the sixteenth optical signal.

23. The method of claim 19 or 20, further comprising:

receiving a first optical carrier, and performing coherent detection on the twelfth optical signal and the first optical carrier to obtain a first coherent detection signal;

receiving a second optical carrier, and performing coherent detection on the thirteenth optical signal and the second optical carrier to obtain a second coherent detection signal;

processing the first digital signal and the second digital signal.

24. The method of claim 23, wherein the at least three optical signals further comprise: a seventeenth optical signal, the method further comprising:

receiving a third optical carrier, and performing coherent detection on the seventeenth optical signal and the third optical carrier to obtain a third coherent detection signal;

processing the third digital signal.